When Climate Reshapes Real Estate Value

When climate begins to redraw real estate value

The coastal erosion observed today along parts of the French coastline is not an isolated phenomenon: it represents one of the first visible signs of a profound transformation of the real estate market under the impact of climate change. Behind the initial property discounts, insurance tensions, and regulatory restrictions lies a structural shift: the gradual integration of physical climate risks into the economic value of assets. Yet the tools still used during real estate transactions rely largely on a static, backward-looking view of risk. As insurers, banks, and investors adopt forward-looking approaches that incorporate the future evolution of hazards, a new requirement is emerging: having a prospective, granular, and financial climate assessment of real estate assets. Tomorrow, buying or selling a property without understanding its future risk trajectory could become just as risky as acquiring an asset without a prior financial audit.

When climate risk begins to alter real estate prices

The article recently published by Le Monde on the municipality of Agon-Coutainville, in the Manche department, provides a concrete illustration of a still-emerging phenomenon: the gradual integration of climate risk into property valuation mechanisms.

In this historically attractive seaside resort, shoreline retreat and coastal flooding risks are now beginning to produce visible economic effects. New coastal risk mapping has led to significant restrictions on building and extension permits for certain properties. Real estate projects have been abandoned following regulatory zoning revisions, while some plots once considered buildable have now become heavily constrained.

Even more significantly, the market itself appears to be starting to factor these risks into prices. The article notably mentions price discounts in the range of 10% to 20% for certain properties located in areas identified as exposed to flood risk.

This shift is major. For decades, proximity to the coastline was essentially a positive valuation driver. Now, that appeal is beginning to be offset by the growing anticipation of future physical risks, insurance costs, regulatory constraints, and potential restrictions on use.

An awareness that remains incomplete

One of the most striking aspects of the report lies in the coexistence of vastly different perceptions of risk.

Some buyers continue to invest in highly exposed properties despite an explicit awareness of future risks. Others, on the contrary, are beginning to base their real estate decisions on the climate exposure of specific areas.

This situation reflects a transitional phase in which real estate markets still only imperfectly factor in the future economic consequences of climate change.

Yet this issue is becoming central in a sector characterized by particularly long investment horizons. A real estate asset is generally held for several decades. However, the tools used today to assess real estate risk remain largely built on a static, retrospective view of hazards.

Géorisques: a framework designed to inform, not to anticipate

The ultimate authority regarding climate and natural risks associated with a property remains the notary, who relies on the official risk disclosure statement—the "blue-white-red" document issued by Géorisques. Handed over during real estate transactions, this document is still the primary reference used to inform buyers and sellers about natural hazards likely to affect a property, and therefore, indirectly, one of the benchmarks used to adjust its market value.

However, this system has several major structural limitations.

The first stems from its fundamentally static nature. The document relies on a historical and regulatory representation of risk, without incorporating the future evolution of the climate or the progressive worsening dynamics of hazards. Yet a real estate asset is acquired for several decades: evaluating a property solely based on a current or past snapshot of risk means ignoring the climate transformations likely to impact its value, insurability, and habitability over its holding period.

A second major limitation concerns flooding. Géorisques assessments focus primarily on regulatory mapping based on 100-year return period scenarios and generally do not account for more extreme events, whose frequency and intensity tend to increase under the influence of climate change.

Above all, these assessments do not include surface runoff flooding phenomena—that is, situations in which stormwater drainage systems become unable to absorb extreme precipitation. Yet today, these events account for approximately one out of two "flood" natural disaster declarations in France. This risk reportedly affects nearly one in five properties, without owners being fully aware of it, precisely because these phenomena remain inadequately covered by traditional regulatory mapping.

The reality observed in recent years thus shows a multiplication of events that far exceed the historical benchmarks used in regulatory frameworks. Properties considered unexposed in traditional assessments may, in practice, suffer severe and sometimes repeated flooding.

Furthermore, the Géorisques assessment provides neither localized climate projections at the property level, nor prospective trends in hazards, nor estimates of potential future economic consequences linked to climate change. Nor does it make it possible to evaluate the actual vulnerability of the building: construction quality, sensitivity of equipment, dependence on surrounding infrastructure, resilience capacity, or the potential cost of future damage.

In other words, a significant portion of the real estate stock could today be exposed to climate risks that are largely underestimated—or even invisible—within the regulatory tools used during acquisition, investment, or financing decisions.

The quiet pivot of insurers

In this system, each stakeholder still tends to rely on the existing regulatory framework. The real estate agent seeks above all to close the transaction quickly. The seller hides behind the regulatory assessment to justify the property's price. The buyer often places trust in the official government document and may believe they have recourse if a property presented as low-risk ultimately proves vulnerable.

Yet a quiet pivot is already underway.

Insurers and reinsurers no longer rely solely on Géorisques. For several years, they have gradually shifted their framework, moving from a mutualized model in which "good" risks offset "bad" risks to much more differentiated pricing approaches that factor in the actual exposure level of each asset.

Their models now employ probabilistic approaches, forward-looking climate projections, high spatial resolution analyses, and hazard evolution scenarios. The goal is no longer just to identify present risks, but to anticipate their future trajectory and potential economic impacts.

In other words, while part of the real estate market continues to operate with static tools, financial and insurance players have already begun integrating future climate conditions into their decision-making models.

Toward a next-generation "climate audit"

This shift raises a fundamental question: how can one continue to buy, sell, or finance a real estate asset without a forward-looking view of its future climate exposure?

Tomorrow, a simple regulatory assessment will likely no longer be enough.

As climate risks increasingly influence prices, insurance terms, borrowing capacity, and investment strategies, a new generation of tools will become necessary: assessments capable not only of identifying a risk, but of quantifying its future economic consequences at the precise asset level.

This requires moving beyond traditional regulatory approaches to incorporate:

·        the future evolution of climate at the building's exact coordinates;

·        the probable evolution of hazards over the coming decades;

·        the actual vulnerability of the property and its equipment;

·        potential financial losses associated with future damage;

·        potential business interruptions;

·        changes in insurance costs;

·        devaluation risks;

·        future regulatory constraints;

·        as well as dependencies on surrounding critical infrastructure.

It is precisely this logic that underpins the approaches developed by Tardigrade AI.

The goal is no longer simply to indicate that an asset is exposed to a risk, but to understand how that risk will evolve over time, how much it could cost, and what measures could mitigate its future impacts.

For a buyer, this means avoiding a double blow: acquiring a property at a price disconnected from its actual future risk, only to discover down the line that insurance costs are skyrocketing—or that the property is becoming uninsurable.

For a seller, this approach conversely makes it possible to objectively demonstrate that certain adaptation measures or resilience investments help preserve the property's future value, resilience, and insurability.

In other words, the prospective climate audit is progressively becoming a central tool for securing real estate transactions.

Climate risk is becoming a financial risk

The article in Le Monde also highlights another major transformation: the gradual rise in insurance market tensions.

It points to coverage denials and premium increases stemming from improved mapping tools used by insurers to refine their coastal exposure assessments.

Yet this development extends far beyond the insurance sector alone.

When insurance costs increase, when certain areas become harder to insure, when regulatory constraints tighten, and when property valuation outlooks deteriorate, climate risk gradually turns into a systemic financial risk.

Banks and investors are then confronted with several simultaneous challenges: potential depreciation of real estate collateral, reduced liquidity in certain local markets, rising financing costs, or the progressive emergence of assets at risk of permanently losing their economic value.

In this context, physical climate risk ceases to be solely an environmental concern. It becomes a direct determinant of financial stability and asset valuation.

Adaptation as an economic trade-off

This transformation also profoundly changes the way adaptation investments must be evaluated.

The challenge is not to mechanically weigh the cost of works against the cost of inaction. The real trade-off lies in comparing the cost of adaptation measures with the reduction in future losses made possible by those measures.

In other words, a resilience investment becomes economically justified when the net present value of the losses avoided through adaptation measures exceeds the cost of implementing those measures.

This logic makes it possible to identify which resilience measures are most effective, which assets should be adapted as a priority, at what time horizon investments become profitable, and how to optimize adaptation strategies across a real estate or infrastructure portfolio.

Coastal erosion is merely an indicator

The case of Agon-Coutainville goes far beyond the Normandy coast alone.

Coastal erosion here serves as an early indicator of a much deeper transformation: the progressive pricing of physical climate risks into the economic value of assets.

Tomorrow, similar dynamics will affect millions of assets well beyond coastal areas—properties exposed to surface runoff flooding, wildfires, geotechnical drought (subsidence), or extreme heatwaves.

In many cases, these vulnerabilities remain insufficiently visible in traditional risk assessment tools. Yet their economic consequences could become major in the decades ahead.

In this context, the ability to quantify the future impacts of climate change in a prospective, granular, and financial manner becomes essential.

Because the fundamental question is no longer just whether an asset is exposed today.

The real question now becomes: what will the future economic trajectory of this exposure look like? What losses could it generate? What portion of these losses can be avoided through adaptation? And at what point will inaction become economically untenable?

Ultimately, a central question is now emerging for the entire real estate market: what is the asset we are about to buy truly worth in a world where the climate is changing faster than the frameworks used to assess risk?

It is precisely at the intersection of climate science, physical risk modeling, and adaptation economics that a growing share of the future value of real estate assets will now be determined.

Frequently Asked Questions

Does climate change lower real estate values?

The first price discounts are already visible. In Agon-Coutainville, Le Monde reports drops in the range of 10% to 20% for certain properties located in flood-exposed areas, as well as projects abandoned following regulatory zoning revisions. The market is still only imperfectly factoring in these risks: we are in a transition phase.

Is the Géorisques assessment enough to understand a property's climate risk?

No. The risk disclosure statement is static and retrospective: it relies on regulatory mapping (100-year flood scenario), does not project climate trends at the property level, and does not evaluate the building's actual vulnerability. Nor does it factor in surface runoff, which is nonetheless the cause of approximately one out of two "flood" natural disaster declarations in France.

Why does insurance change the value of an exposed property?

Certain insurers are gradually shifting from a mutualized model to differentiated pricing based on probabilistic models and climate projections. Le Monde thus points to coverage denials and premium increases linked to the refinement of coastal exposure mapping. The buyer faces a double blow: a price disconnected from future risk, followed by insurance that becomes more expensive or difficult to obtain.

What are the benefits of a forward-looking climate assessment for a real estate asset?

It quantifies the evolution of hazards at the building's exact coordinates, its actual vulnerability, potential financial losses, changes in insurance costs, and the risk of devaluation. It then compares the cost of adaptation measures with the losses they help prevent. This is the logic of Horizon, which quantifies the climate impact on each of your sites or across your portfolio in euros.

Buying, selling, or financing a real estate asset? Horizon quantifies the climate impact on each of your sites in euros and identifies the most cost-effective adaptation measures; Protect alerts you up to 5 days in advance when a critical threshold is about to be exceeded. Book a meeting with our experts.